Head gasket failure is not common on the TD4.
Was it losing water?
Has it been over heated?
If the answer is no to both, I would look at the oil cooler. It is located on the side of the oil filter housing. Remove it and pressurize the coolant side to 15psi with compressed air and submerge it in water. if it bubbles it is shot.
If it is the head gasket, you need service tools to do the timing. there is no key ways in the cam sprockets.


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